Hyperfine-induced decoherence in triangular spin-cluster qubits

Troiani, Filippo and Stepanenko, Dimitrije and Loss, Daniel. (2012) Hyperfine-induced decoherence in triangular spin-cluster qubits. Physical Review B, Vol. 86, H. 16 , 161409.

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Official URL: http://edoc.unibas.ch/dok/A6083490

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We theoretically investigate hyperfine-induced decoherence in a triangular spin cluster for different qubit encodings. Electrically controllable eigenstates of spin chirality (C-z) show no appreciable decoherence up to 10(2) mu s, while a complete decoherence is estimated for the eigenstates of the total-spin projection (S-z) and of the partial spin sum (S-12) after 10 mu s. The robustness of chirality is due to its decoupling from both the total- and individual-spin components in the cluster. This results in a suppression of the effective interaction between C-z and the nuclear-spin bath. We finally estimate the reduction of the decoherence time scale for C-z, resulting from possible hyperfine contact terms or from the misalignment of the magnetic field.
Faculties and Departments:05 Faculty of Science > Departement Physik
05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Mesoscopics (Loss)
UniBasel Contributors:Loss, Daniel
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Institute of Physics
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:10 Apr 2015 09:13
Deposited On:24 May 2013 09:02

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